package com.hmdp.service.impl;

import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.ArrayList;
import java.util.List;

import static com.hmdp.constants.ShopConstant.SHOP_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result queryTypeList() {
        // 1、从redis中查询商户类型
        List<String> shopTypes =
                stringRedisTemplate.opsForList().range(SHOP_TYPE_KEY, 0, -1);

        if (shopTypes.size() != 0) {
            // 2、缓存命中，直接返回
            List<ShopType> shopTypeList = new ArrayList<>();
            for (String shopType : shopTypes) {
                shopTypeList.add(JSONUtil.toBean(shopType, ShopType.class));
            }
            return Result.ok(shopTypeList);
        }
        // 3、redis中不存在，查询数据库
        List<ShopType> typeList = query().orderByAsc("sort").list();
        // 4、建立缓存
        List<String> saveTypes = new ArrayList<>();
        typeList.forEach(type -> {
            saveTypes.add(JSONUtil.toJsonStr(type));
        });
        stringRedisTemplate.opsForList().rightPushAll(SHOP_TYPE_KEY, saveTypes);
        // 5、返回商户类型
        return Result.ok(typeList);
    }
}
